Yes, in some fanfiction he can survive. Writers often give him special abilities or plot armor that allows him to endure the power of the Infinity Gauntlet. Maybe he has some sort of new technology that he's developed which can help him manage the power and not be completely destroyed by it.
In fanfiction, if Tony Stark uses the Infinity Gauntlet, he might be able to rewrite reality in ways that benefit Earth. He could potentially eliminate all threats to the planet, like getting rid of all alien invaders forever. Also, he could use it to solve global problems such as poverty and environmental degradation. He might create a world where technology is so advanced that everyone has a high quality of life.
One interesting fanfiction could be where Tony Stark uses the Infinity Gauntlet to reverse the Snap in a completely different way than in the movies. Maybe he has to sacrifice his own intellect to power the Gauntlet fully, leading to a whole new set of challenges for the Avengers to deal with.
In many Infinity Gauntlet fanfictions, Tony Stark's character development is centered around his relationship with power. At first, he may be tempted by the unlimited power of the gauntlet. But as the story progresses, he could come to understand that true power lies not just in the gauntlet but in the relationships he has built with his friends and allies. He may learn that the power of teamwork and friendship is more important than any magical object, and this realization could completely transform his character for the better.
Stark did have moments when he wielded the Infinity Gauntlet in the comics. It was usually in situations where his ingenuity and determination were crucial to saving the day or dealing with cosmic-level threats.
Well, in a fanfiction scenario where Tony has the gauntlet in Infinity War, he might try to use it to defeat Thanos right away. Maybe he figures out how to control it quickly and unleashes a powerful blast that could turn the tide of the battle.
Well, perhaps the plot could involve Tony Stark's quest to collect all the Infinity Stones for some noble purpose. Maybe he wants to use their power to prevent a greater threat to the universe than Thanos ever was.
In a Batman Infinity Gauntlet fanfiction, Batman would face a moral dilemma. The power of the gauntlet is immense and corrupting. He would have to struggle with whether to use it for what he believes is the greater good or to resist its allure completely. He could also encounter other powerful beings from the DC universe who either want to take the gauntlet from him or help him control its power.